FBOM SIAM AND MALAYSIA. 321 



transverse sulcus, the anterior covered portion finely coucen- 

 trically striolate, the posterior portion smooth, or nearly so, 

 above, longitudinally striate below, the striae not extending as 

 high as the pore ; pores situated in about the middle of the side, 

 small just behind the transverse groove, which at this spot is 

 lightly sinuate ; sterna smooth ; ventral grooves long and deep. 

 Anal tergite produced into a caudal process, which overhangs the 

 valves and is slightly upcurled at the apex (except in 8. Sosei) ; 

 valves convex, with compressed or sulcate margins ; sternite 

 triangular. Legs (in S ) smooth above, the segments bearing a 

 few hairs below, a spine above the claw and a few in two series 

 on the lower surface of the terminal segment, which is not padded 

 beneath ; penultimate and antepenultimate padded beneath. 



Spieostreptus Boweinqii, sp. n. 



(S . Colour (faded) mostly ochraceous, the hinder borders of 

 the tergites castaneous ; antennse and legs concolorous, ochraceous. 



Distance between the eyes nearly twice a diameter. 



Antennce long, extending beyond the hinder margin of the first 

 tergite. 



First tergite moderately narrowed laterally, the anterior angle 

 nearly a right angle, the margin thickened and defined by a 

 strong sulcus, the posterior border lightly emarginate, the 

 posterior angle also nearly a right angle, smooth or marked 

 posteriorly with a few abbreviated sulci. 



Anal tergite flat above from behind forwards, not transversely 

 constricted, the caudal process slender, pointed, and upcurled; 

 valves with their posterior border very lightly convex, margins 

 strongly compressed, but hardly thickened ; the sternite defined 

 by a groove. 



Copulatory feet — anterior lamina flat, slender, and diverging 

 above, expanded and converging below, the inner edge of the 

 terminal expansion emarginate and denticulate ; the protrusible 

 portion terminating in a lamelliform piece, and bearing two long, 

 slender, subequal styles, which curve towards each other. 



Number of segments 60. 



Length 158 millim. 



Sah. A single male example from Siam {J. C. Boioring). 



Closely related to Sp. opinatus, Karsch, from Tenasserim and 

 Mergui {vide Pocock, Journ. Linn. Soc, Zool. xxi. pp. 294, 295, 

 pi. XXV. figs. 2-2 c), but differing at least in the form of the 



